/*Software DriverSST25VF016B 16 Mbit(2M x 8) Serial Flash MemoryAugust 1st, 2005, Rev. 1.0ABOUT THE SOFTWAREThis application note provides software driver examples for SST25VF016B,Serial Flash. Extensive comments are included in each routine to describe the function of each routine.  The interface coding uses polling method rather than the SPI protocol to interface with these serial devices.  Thefunctions are differentiated below in terms of the communication protocols(uses Mode 0) and specific device operation instructions. This code has been designed to compile using the Keil compiler.ABOUT THE SST25VF016BCompanion product datasheets for the SST25VF016B should be reviewed in conjunction with this application note for a complete understanding of the device.Device Communication Protocol(pinout related) functions:Functions                    		Function------------------------------------------------------------------init					Initializes clock to set up mode 0.Send_Byte				Sends one byte using SI pin to send and 					shift out 1-bit per clock rising edgeGet_Byte				Receives one byte using SO pin to receive and shift 					in 1-bit per clock falling edgePoll_SO					Used in the polling for RY/BY# of SO during AAI programmingCE_High					Sets Chip Enable pin of the serial flash to highCE_Low					Clears Chip Enable of the serial flash to lowHold_Low				Clears Hold pin to make serial flash holdUnhold					Unholds the serial flashWP_Low					Clears WP pin to make serial flash write protectedUnWP					Disables write protection pinNote:  The pin names of the SST25VF016B are used in this application note. The associated test codewill not compile unless these pinouts (SCK, SI, SO, SO, CE, WP, Hold) are pre-defined on yoursoftware which should reflect your hardware interfaced. 	 Device Operation Instruction functions:*///Functions                    		Function------------------------------------------------------------------Read_Status_Register			Reads the status register of the serial flashEWSR					Enables the Write Status RegisterWRSR					Performs a write to the status registerWREN					Write enables the serial flashWRDI					Write disables the serial flashEBSY					Enable SO to output RY/BY# status during AAI programmingDBSY					Disable SO to output RY/BY# status during AAI programmingRead_ID					Reads the manufacturer ID and device IDJedec_ID_Read				Reads the Jedec IDRead					Reads one byte from the serial flash and returns byte(max of 25 MHz CLK frequency)Read_Cont				Reads multiple bytes(max of 25 MHz CLK frequency)HighSpeed_Read				Reads one byte from the serial flash and returns byte(max of 50 MHz CLK frequency)HighSpeed_Read_Cont			Reads multiple bytes(max of 50 MHz CLK frequency)Byte_Program				Program one byte to the serial flashAuto_Add_IncA				Initial Auto Address Increment processAuto_Add_IncB				Successive Auto_Address_Increment process after AAI initiationAuto_Add_IncA_EBSY			Initial Auto Address Increment process with EBSYAuto_Add_IncB_EBSY			Successive Auto_Address_Increment process after AAI initiation with EBSYChip_Erase				Erases entire serial flashSector_Erase				Erases one sector (4 KB) of the serial flashBlock_Erase_32K				Erases 32 KByte block memory of the serial flashBlock_Erase_64K				Erases 64 KByte block memory of the serial flashWait_Busy				Polls status register until busy bit is lowWait_Busy_AAI				Polls status register until busy bit is low for AAI programmingWREN_Check				Checks to see if WEL is setWREN_AAI_Check				Checks to see if WEL and AAI mode is set                                                                     "C" LANGUAGE DRIVERS /********************************************************************//* Copyright Silicon Storage Technology, Inc. (SST), 1994-2005	    *//* Example "C" language Driver of SST25VF016B Serial Flash	    *//* Conrado Canio, Silicon Storage Technology, Inc.                  *//*                                                                  *//* Revision 1.0, August 1st, 2005			  	    */   /*                                                                  *//*								    *//********************************************************************/#include <stdio.h>#include <stdlib.h>/* Function Prototypes */void init();void Send_Byte(unsigned char out);unsigned char Get_Byte();void Poll_SO();void CE_High();void CE_Low();void Hold_Low();void Unhold();void WP_Low();void UnWP();unsigned char Read_Status_Register();void EWSR();void WRSR(byte);void WREN();void WRDI();void EBSY();void DBSY();unsigned char Read_ID(ID_addr);unsigned long Jedec_ID_Read(); unsigned char Read(unsigned long Dst);void Read_Cont(unsigned long Dst, unsigned long no_bytes);unsigned char HighSpeed_Read(unsigned long Dst); void HighSpeed_Read_Cont(unsigned long Dst, unsigned long no_bytes);void Byte_Program(unsigned long Dst, unsigned char byte);void Auto_Add_IncA(unsigned long Dst, unsigned char byte1, unsigned char byte2);void Auto_Add_IncB(unsigned char byte1, unsigned char byte2);void Auto_Add_IncA_EBSY(unsigned long Dst, unsigned char byte1, unsigned char byte2);void Auto_Add_IncB_EBSY(unsigned char byte1, unsigned char byte2);void Chip_Erase();void Sector_Erase(unsigned long Dst);void Block_Erase_32K(unsigned long Dst);void Block_Erase_64K(unsigned long Dst);void Wait_Busy();void Wait_Busy_AAI();void WREN_Check();void WREN_AAI_Check();void Verify(unsigned char byte, unsigned char cor_byte);unsigned char idata upper_128[128];	/* global array to store read data */					/* to upper RAM area from 80H - FFH *//************************************************************************//* PROCEDURE: init							*//*									*//* This procedure initializes the SCK to low. Must be called prior to 	*//* setting up mode 0.							*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		SCK							*//************************************************************************/void init(){	SCK = 0;	/* set clock to low initial state */}/************************************************************************//* PROCEDURE: Send_Byte							*//*									*//* This procedure outputs a byte shifting out 1-bit per clock rising	*//* edge on the the SI pin(LSB 1st).					*//*									*//* Input:								*//*		out							*//*									*//* Output:								*//*		SI							*//************************************************************************/void Send_Byte(unsigned char out){		unsigned char i = 0;	for (i = 0; i < 8; i++)	{				if ((out & 0x80) == 0x80)	/* check if MSB is high */			SI = 1;		else			SI = 0;			/* if not, set to low */		SCK = 1;			/* toggle clock high */		out = (out << 1);		/* shift 1 place for next bit */		SCK = 0;			/* toggle clock low */	}}/************************************************************************//* PROCEDURE: Get_Byte							*//*									*//* This procedure inputs a byte shifting in 1-bit per clock falling	*//* edge on the SO pin(LSB 1st).						*//*									*//* Input:								*//*		SO							*//*									*//* Output:								*//*		None							*//************************************************************************/unsigned char Get_Byte(){	unsigned char i = 0, in = 0, temp = 0;	for (i = 0; i < 8; i++)	{		in = (in << 1);		/* shift 1 place to the left or shift in 0 */		temp = SO;		/* save input */		SCK = 1;		/* toggle clock high */	if (temp == 1)			/* check to see if bit is high */		in = in | 0x01;		/* if high, make bit high */		SCK = 0;		/* toggle clock low */	}	return in;}/************************************************************************//* PROCEDURE: Poll_SO							*//*									*//* This procedure polls for the SO line during AAI programming  	*//* waiting for SO to transition to 1 which will indicate AAI programming*//* is completed								*//*									*//* Input:								*//*		SO							*//*									*//* Output:								*//*		None							*//************************************************************************/void Poll_SO(){	unsigned char temp = 0;	CE_Low();       	while (temp == 0x00)	/* waste time until not busy */		temp = SO;	CE_High();}/************************************************************************//* PROCEDURE: CE_High							*//*									*//* This procedure set CE = High.					*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		CE							*//*									*//************************************************************************/void CE_High() {	CE = 1;				/* set CE high */}/************************************************************************//* PROCEDURE: CE_Low							*//*									*//* This procedure drives the CE of the device to low.  			*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		CE							*//*									*//************************************************************************/void CE_Low() {		CE = 0;				/* clear CE low */}/************************************************************************//* PROCEDURE: Hold()							*//*									*//* This procedure clears the Hold pin to low.				*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		Hold							*//************************************************************************/void Hold_Low(){	Hold = 0;			/* clear Hold pin */}/************************************************************************//* PROCEDURE: Unhold()							*//*									*//* This procedure sets the Hold pin to high.				*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		Hold							*//************************************************************************/void Unhold(){	Hold = 1;			/* set Hold pin */}/************************************************************************//* PROCEDURE: WP()							*//*									*//* This procedure clears the WP pin to low.				*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		WP							*//************************************************************************/void WP_Low(){	WP = 0;				/* clear WP pin */}/************************************************************************//* PROCEDURE: UnWP()							*//*									*//* This procedure sets the WP pin to high.				*//*									*//* Input:								*//*		None							*//*									*//* Output:								*//*		WP							*//************************************************************************/void UnWP(){	WP = 1;				/* set WP pin */}/************************************************************************//* PROCEDURE: Read_Status_Register					*//*									*//* This procedure read the status register and returns the byte.	*//*									*//* Input:								*//*		None							*//*									*//* Returns:								*//*		byte							*//************************************************************************/unsigned char Read_Status_Register(){	unsigned char byte = 0;	CE_Low();			/* enable device */	Send_Byte(0x05);		/* send RDSR command */	byte = Get_Byte();		/* receive byte */